In all of the episodes that I've watched which consists of all of TNG, DS9, VOY, & ENT, I've never seen a single screw, nut or bolt, even a rivet in the future. Somebody has to make the prototype of the item or part that gets mass replicated. How did they put all the items together in the first place? Did they just weld or sodder everything together? I'm assuming they must use something to hold all their tools, gadgets, pipes, etc together. Any ideas from you fans?